Giant balloon-like structures discovered at center of Milky Way

An international team of astronomers, including Northwestern’s Farhad Yusef-Zadeh, has discovered one of the largest structures ever observed in the Milky Way. A newly spotted pair of radio-emitting bubbles reach hundreds of light-years tall, dwarfing all other structures in the central region of the galaxy.

The team believes the enormous, hourglass-shaped structure likely is the result of a phenomenally energetic burst that erupted near the Milky Way’s supermassive black hole several million years ago.

“The center of our galaxy is relatively calm when compared to other galaxies with very active central black holes,” said Ian Heywood of the University of Oxford, first author of study. “Even so, the Milky Way’s central black hole can — from time to time — become uncharacteristically active, flaring up as it periodically devours massive clumps of dust and gas. It’s possible that one such feeding frenzy triggered powerful outbursts that inflated this previously unseen feature.”

For this work, the team used the South African Radio Astronomy Observatory (SARAO) MeerKAT telescope, the largest science project in Africa. This is the first paper detailing research completed with MeerKAT’s full 64-dish array since its launch in July 2018.

Mysteries of the Milky Way

More turbulent and unusually active compared to rest of the Milky Way, the environment surrounding our galaxy’s central black hole holds many mysteries. Northwestern’s Yusef-Zadeh, a senior author of the paper, has dedicated his career to studying the physical processes that occur in the Milky Way’s mystifying center.

In the early 1980s, Yusef-Zadeh discovered large-scale, highly organized magnetic filaments in the center of the Milky Way, 25,000 light-years from Earth. While their origin has remained an unsolved mystery ever since, the filaments are radio structures stretching tens of light-years long and one light-year wide.

“The radio bubbles discovered with MeerKAT now shed light on the origin of the filaments,” Yusef-Zadeh said. “Almost all of the more than 100 filaments are confined by the radio bubbles.”

Researchers believe the close association of the filaments with the bubbles implies that the energetic event that created the radio bubbles also is responsible for accelerating the electrons required to produce the radio emission from the magnetized filaments.

The team of astronomers on this project represents 15 institutions, including Northwestern, Oxford, the South African Radio Astronomy Observatory in Cape Town and the National Radio Astronomy Observatory in Virginia. The research paper appears in the journal Nature.

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